package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.LocalTime;

/**
 * 自定义切面,实现 自动填充公共字段的切面
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 插入操作的切点
     * mapper中类和方法
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){

    }

    /**
     * 前置通知，在通知中填充公共字段
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充");

        // 获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature=(MethodSignature) joinPoint.getSignature();
        AutoFill autoFill=signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType=autoFill.value();

        //方法的参数
        Object[] args=joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }
        Object object=args[0];

        //通过反射对属性进行赋值
        if(operationType==OperationType.INSERT){
            //设置更新时间、更新人、创建时间、创建人
            try {
                Method setUpdateTime=object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateTime=object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUser=object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateUser=object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                setUpdateTime.invoke(object,LocalDateTime.now());
                setCreateTime.invoke(object,LocalDateTime.now());
                setUpdateUser.invoke(object,BaseContext.getCurrentId());
                setCreateUser.invoke(object, BaseContext.getCurrentId());
            } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        else if(operationType==OperationType.UPDATE){
            //设置更新时间、更新人
            try {
                Method setUpdateTime=object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser=object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(object,LocalDateTime.now());
                setUpdateUser.invoke(object,BaseContext.getCurrentId());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
